chore: adjusted the project directory structure

app/navigatorview.h

@@ -0,0 +1,34 @@
+#ifndef NAVIGATORVIEW_H
+#define NAVIGATORVIEW_H
+
+#include <QGraphicsView>
+
+class OpacityHelper;
+class GraphicsView;
+class NavigatorView : public QGraphicsView
+{
+    Q_OBJECT
+public:
+    NavigatorView(QWidget *parent = nullptr);
+
+    void setMainView(GraphicsView *mainView);
+    void setOpacity(qreal opacity, bool animated = true);
+
+public slots:
+    void updateMainViewportRegion();
+
+private:
+    void mousePressEvent(QMouseEvent * event) override;
+    void mouseMoveEvent(QMouseEvent * event) override;
+    void mouseReleaseEvent(QMouseEvent * event) override;
+
+    void wheelEvent(QWheelEvent *event) override;
+    void paintEvent(QPaintEvent *event) override;
+
+    bool m_mouseDown = false;
+    QPolygon m_viewportRegion;
+    QGraphicsView *m_mainView = nullptr;
+    OpacityHelper *m_opacityHelper = nullptr;
+};
+
+#endif // NAVIGATORVIEW_H